What is dobereiner traids
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In 1829, the German chemist Johann Wolfgang Döbereiner noted that there were triads of elements that showed similar chemical properties. He also noted that other properties of the elements followed trends in which the value of the middle element of the triad was in between those of the end members.
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he tried to arrenge 3 elements in a group where the average of atomic masses of 1 and last element was roughly equal to the atomic mass of the middle element
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